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arXiv · 1802.05013

Nuclear spin-lattice relaxation in p-type GaAs

M. Kotur·R. I. Dzhioev·M. Vladimirova·R. V. Cherbunin·P. S. Sokolov·D. R. Yakovlev·M. Bayer·D. Suter·K. V. Kavokin
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Abstract

Spin-lattice relaxation of the nuclear spin system in p-type GaAs is studied using a three-stage experimental protocol including optical pumping and measuring the difference of the nuclear spin polarization before and after a dark interval of variable length. This method allows us to measure the spin-lattice relaxation time $T_1$ of optically pumped nuclei "in the dark", that is, in the absence of illumination. The measured $T_1$ values fall into the sub-second time range, being three orders of magnitude shorter than in earlier studied n-type GaAs. The drastic difference is further emphasized by magnetic-field and temperature dependences of $T_1$ in p-GaAs, showing no similarity to those in n-GaAs. This unexpected behavior is explained within a developed theoretical model involving quadrupole relaxation of nuclear spins, which is induced by electric fields within closely spaced donor-acceptor pairs.

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M. Kotur, R. I. Dzhioev, M. Vladimirova, R. V. Cherbunin, P. S. Sokolov, D. R. Yakovlev, M. Bayer, D. Suter, K. V. Kavokin. 2018-02-14. Nuclear spin-lattice relaxation in p-type GaAs. https://doi.org/10.1103/physrevb.97.165206

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